Subaru Legacy Spec B Level 5 Axle/Hub system is a complete rear system including both axles and larger diameter spline wheel hubs. The axles feature our aerospace grade torsional 32 spline axle bars, a billet ball & cage inner cv. Reinforced with our aerospace grade inner differential spline for the R180 differential, and a proprietary outer CV with a larger spline. The hubs are made to accommodate the larger spline Rated to 1000HP with